seeing as the Turtle Beach x12s are gaming headphones I'd say they would be the best, but as we don't sell them I can't give an opinion on the sound. We do sell the Fidelios though and they sound great!

Philips Fidelio are true hifi headphones (I have purchased two of those). I haven't seen any reviews of Turtle Beach which suggest that they compete for hifi sound quality, and having heard a couple models at the local Brookstone store, I would also say they don't compete that way. So they may be better for gaming, but the Fidelio headphones will have better fidelity for music.